According to Torrington, a job description is usually developed by conducting a job analysis, which includes examining the tasks and sequences of tasks necessary to perform the job. The analysis considers the areas of knowledge and skills needed for the job. A job usually includes several roles. According to Hall, the job description might be broadened to form a person specification or may be known as "terms of reference". The person/job specification can be presented as a stand-alone document, but in practice it is usually included within the job description. A job description is often used by employers in the recruitment process.
Properly written job position descriptions are often the only document that totally define what a role is, what skills are required to perform it, and where the role fits in an organization. This makes it simple to identify candidates that are a good fit for the role and also to hold candidates accountable if they are not performing essential duties that are required in the role.